// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_LOOKUP_CACHE_INL_H_
#define V8_LOOKUP_CACHE_INL_H_

#include "src/lookup-cache.h"

#include "src/objects-inl.h"

namespace v8 {
namespace internal {

    // static
    int DescriptorLookupCache::Hash(Map source, Name name)
    {
        DCHECK(name->IsUniqueName());
        // Uses only lower 32 bits if pointers are larger.
        uint32_t source_hash = static_cast<uint32_t>(source.ptr()) >> kTaggedSizeLog2;
        uint32_t name_hash = name->hash_field();
        return (source_hash ^ name_hash) % kLength;
    }

    int DescriptorLookupCache::Lookup(Map source, Name name)
    {
        int index = Hash(source, name);
        Key& key = keys_[index];
        if ((key.source == source) && (key.name == name))
            return results_[index];
        return kAbsent;
    }

    void DescriptorLookupCache::Update(Map source, Name name, int result)
    {
        DCHECK_NE(result, kAbsent);
        int index = Hash(source, name);
        Key& key = keys_[index];
        key.source = source;
        key.name = name;
        results_[index] = result;
    }

} // namespace internal
} // namespace v8

#endif // V8_LOOKUP_CACHE_INL_H_
